The 2012 Forester with the naturally-aspirated 2.5L H4 is a solid platform, but the EJ25 engine has persistent head gasket issues that dominate ownership cost beyond 100k miles. CVT models tend to develop transmission cooler and mount problems.
Head Gasket Failure (External Oil Leaks)
Common · medium severityTypical onset: 90,000-130,000 mi
Symptoms: Oil seepage visible on outside of engine block, especially lower corners, Burning oil smell after driving, Slow oil consumption (top-offs between changes), No coolant mixing or overheating in most cases
Fix: Both head gaskets, timing components, water pump, valve cover gaskets typically done as a package. 12-16 hours labor depending on shop efficiency. Some owners opt for short block if internal wear is found during teardown.
Estimated cost: $2,200-3,200
CVT Transmission Oil Cooler Line Leaks
Common · high severityTypical onset: 80,000-120,000 mi
Symptoms: Red transmission fluid pooling under vehicle, near front, Burnt smell if fluid level drops significantly, Transmission overheating warnings on severe cases, Slipping or delayed engagement if driven low on fluid
Fix: Replace cooler lines and fittings where they pass through crossmember. Often corroded at connection points. 2-3 hours labor, fluid flush required afterward.
Estimated cost: $400-700
Piston Ring Land Failure / Excessive Oil Consumption
Occasional · high severityTypical onset: 60,000-100,000 mi
Symptoms: Sudden increase in oil consumption (quart per 800-1,200 miles), Blue smoke on cold start or hard acceleration, Fouled spark plugs, Loss of power under load
Fix: Subaru had extended warranty for some VINs, but most 2012s are out of coverage now. Requires short block replacement or full engine rebuild. 18-24 hours labor. This is the catastrophic version of EJ25 problems.
Estimated cost: $4,500-6,500
Transmission Mount Collapse
Common · low severityTypical onset: 70,000-110,000 mi
Symptoms: Clunk when shifting from Park to Drive or Reverse, Vibration at idle in gear, Visible sag or torn rubber on rear transmission mount
Fix: Replace rear transmission mount. 1.5-2 hours labor. Often done alongside head gasket job if already in the shop.
Estimated cost: $250-400
Front Wheel Bearing Failure
Occasional · medium severityTypical onset: 90,000-140,000 mi
Symptoms: Humming or growling noise that increases with speed, Noise changes pitch during turns, Vibration through steering wheel, ABS or traction control lights if sensor damaged
Fix: Replace hub assembly. 2-3 hours per side. Not unique to Subaru, but AWD duty and northern climate exposure accelerates wear.
Estimated cost: $350-550 per side
Airbag Inflator Recall (Takata)
Common · high severitySymptoms: No symptoms until deployment, Recall notice received by mail or VIN check shows open campaign
Fix: Free dealer repair under recall. Passenger airbag inflator replacement. Check VIN before purchase — some still unfixed in the wild. 1-2 hours dealer labor but no cost to owner.
Estimated cost: $0 (recall)
Buy one with documented head gasket replacement already done under 130k miles; skip any with excessive oil consumption or unknown service history.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.